Out camping this weekend and noticed that one of the trailer tires looked to be way overinflated. The tread along the whole tire was bulging up like the tire had 100lbs of air in it. The tread was not flat like the other tires. I got the gauge out and it was actually about 10lbs low which considering we're in a very cold snap makes sense. Put on the spare and it looks like the others again.
Any ideas what happened? Blew a belt? They are radials so there's no way it should have looked like that unless something internally blew out...
You had a tread separation - typically the top belt separates from the bottom belt.
How old are these tires? On the RV websites I frequent, they report that trailer tires last 5 or 6 years, then they are too old and need to be replaced.
Plus, trailer manufacturers didn't do a good job of sizing the tires - not enough load carrying capacity.
Then there's the issue of being 10 psi underinflated.
You might want to consider replacing all the tires. The latest is that the Goodyear Endurance series seems to be the only tire to have solved all the trailer tire issues.